硼泥处理洗涤剂废水的研究

加热后的硼泥处理洗涤剂废水，投加量为０．４％，ＰＨ为３．０－１０．５时，洗涤剂去除率达９４％。洗涤剂在硼泥上的吸附符合Ｆｌｕｎｄｌｉｃｈ吸附等温式，其２０．２５．０，３０．０℃的饱和吸附量分别为６３．０、５７．０、５０．０ｍｇ．ｇ＾－１。吸附速度符合鲛岛动力学方程。     

硼泥复合混凝剂处理采油井管洗涤废水的研究

探讨了利用废渣生产的硼泥复合混凝剂处理采油井管洗涤废水，以及pH值，混凝剂的投加量，搅拌速度，搅拌时间，沉降时间和温度处理效果的影响，当废水的含油量在8500mg/L左右时，投药量为2000mg/L,最佳值范围为4．5－8．5，油COD和SS的去除率分别大于84％，825，98％，沉降时间为35min，搅拌速度，搅拌时间，温度对油，COD和SS的去除率无显著影响，若经双层滤料过滤法或生化法的二级处理，出水达到国家一级排放标准。     

硼泥复合混凝剂处理印染废水的研究

采用自制的硼泥复合混凝剂对所选择的若干水溶性染料水样和实际印染废水进行脱色试验，结果表明，混凝效果与染料种类，投药量，ｐＨ值，温度等因素有关，其中投药量范围在０．３￣０．６ｇ／Ｌ，ｐＨ适用范围为４．０￣１１．５，脱色率均可达９２％以上，在处理实际印染废水样时，仅投加０．３ｇ／Ｌ混凝剂时，其ＣＯＤ去除率达６７％以上，脱色率和ＳＳ去除率均达９８％以上，ｐＨ值也处于６￣９范围之内，并且比聚铝的处理效果好     

The interaction of boron with goethite: experiments and CD-MUSIC modeling

Boron (B) is an essential element for plants and animals growth that interacts with mineral surfaces regulating its bioavailability and mobility in soils, sediments, and natural ecosystems. The interaction with mineral surfaces is quite important because of a narrow range between boron deficiency and toxicity limits. In this study, the interaction of boric acid with goethite (α-FeOOH) was measured in NaNO₃ background solution as a function of pH, ionic strength, goethite and boron concentration representing as adsorption edges and isotherms. Boron adsorption edges showed a bell-shaped pattern with maximum adsorption around pH 8.50, whereas adsorption isotherms were rather linear. The adsorption data were successfully described with the CD-MUSIC model in combination with the Extended Stern (ES) model. The charge distribution (CD) of inner-sphere boron surface complexes was calculated from the geometry optimized with molecular orbital calculations applying density functional theory (MO/DFT). The CD modeling suggested dominant binding of boric acid as a trigonal inner-sphere complex with minor contributions of a tetrahedral inner-sphere complex (at high pH) and a trigonal outer-sphere complex (at low pH). The interpretation with the CD model is consistent with the spectroscopic observations.     

Phytoremediation and long-term site management of soil contaminated with pentachlorophenol (PCP) and heavy metals

Pentachlorophenol (PCP) is a persistent organic pollutant (POP) previously used as a timber treatment chemical to prevent sap stain and wood rot. Commonly used in wood treatment industries for the last 50 years, there are now many sites worldwide that are contaminated with PCP. Although persistent, PCP is a mobile contaminant and therefore has a propensity to leach and contaminate surrounding environments. Both willow (Salix sp., 'Tangoio') and poplar (Populus sp. 'Kawa') growing in an open-ended plastic greenhouse were found to tolerate soil PCP concentrations of 250 mg kg(-1) or less and both species stimulated a significant increase in soil microbial activity when compared to unplanted controls. Both poplar and willow could not survive PCP concentrations above 250 mg kg(-1) in soil. Pentachlorophenol degradation occurred in both planted and unplanted pots, but a higher rate of degradation was observed in the planted pots. Soil contaminated by wood-treatment activities often contains co-contaminants such as B, Cr, Cu and As, that are also used as timber preservatives. An additional column leaching experiment, done along side the potted trial, found that PCP, B, Cr, Cu and As were all present in the column leachate. This indicates that although Cu, Cr and As are generally considered immobile in the soil, they were mobilised under our column conditions. If a contaminated site were to be hydraulically 'sealed' using plants, a reticulation irrigation system should be installed to capture any contaminant leachate resulting from heavy rains. This captured leachate can either be independently treated, or reapplied to the site. Our data demonstrate a reduction in soil hydraulic conductivity with repeated application of leachate containing PCP and metal compounds but the soil did not become anaerobic. This would need to be considered in site remediation design.     

硼化工企业环境污染与防治对策剖析

硼化工企业由于其产生含硼酸等偏酸性污水和显酸性的废渣,对厂区周边的植被和农田的土壤等形成污染,其结果使生态环境难以恢复。通过文献调研、现场考察、专家讨论,结合环境监测部门的现场土壤等采样并对该行业污染成因进行了分析,结果表明该类污水对环境污染的严重性,并提出对该污染的防治对策,采用提出的治理工艺在污染现场对土壤实施修复使污染土地得到恢复。